Here is your answer!
Firstly, water gathers in the portion of the set up B and C
in the hollowed portion say.
The water will enter the potato as a result of osmosis, then,
since the medium surrounding the cell has a higher water concentration than the
cell, which means the water moves inside by osmosis.
Potato A will react as control set-up.
Water doesn’t gather in the hollowed portions of potato A,
because it’s empty.
Water is not able to enter potato D because the potato D is
The boiling will disrupt the cell membrane and for osmosis,
a semi-permeable membrane is required.
So the water will not enter the boiled potato cup.